Many years ago I used a DOS program called Paradox (Relational Database). IMHO It's claim to was Query by example.
The query process presented the user with a form that represented the table(s) (yes there was an easy linking mechanism)
Why worry what the user wants stats on?
Just build the the query tool(s) and export as a CSV that could Open Office Calc or Excel.
Each table could have a Tab on the form (changes color/Bold when active) with fields and selection boxes/spin_wheels/criteria.
and a Run button
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